The North Ranch Open Space includes an extensive system of protected areas that conserve diverse habitats, plants, and animals. This area, which totals 2,604 acres, is primarily owned by COSCA, with a few smaller areas in private ownership. Among the most outstanding resources in this area are the sandstone cliffs of the Simi Hills, spacious mosaics of coastal sage scrub and grassland, pockets of Southern California black walnut groves, and coast live oak woodlands along the area's creeks. Wildlife is abundant, and includes most mammals and birds likely to be seen in the Conejo Valley. A number of sensitive plants also occur in these areas. Access to the North Ranch Open Space is provided at the North Ranch Playfield, and through numerous neighborhood trail access points. North Ranch Open Space trails connect with the Lang Ranch Open Space.